everyone had little chat on public server about this rule and this isn't really possible to drive it like this that you don't get wheels on grass and gain time.
I suggest that you use normal HLVC rule, 2 wheels on tarmac/curb always and other 2 can go on grass.
T1, T2, T6, T8, T13, T14, T15 are the spots where drivers usually have 2 wheels on grass
(even 4 in T2, but that might go thou with only 2)
Not really that i'm up for cutting, it's that there is to many corner with this problem and too little marshals...